643515013 has 4 divisors (see below), whose sum is σ = 649529280. Its totient is φ = 637500748.

The previous prime is 643515007. The next prime is 643515053. The reversal of 643515013 is 310515346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 643515013 - 2¹³ = 643506821 is a prime.

It is a super-2 number, since 2×643515013² = 828223143912780338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643515053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3006973 + ... + 3007186.

It is an arithmetic number, because the mean of its divisors is an integer number (162382320).

Almost surely, 2^643515013 is an apocalyptic number.

It is an amenable number.

643515013 is a deficient number, since it is larger than the sum of its proper divisors (6014267).

643515013 is a wasteful number, since it uses less digits than its factorization.

643515013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6014266.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 643515013 is about 25367.5976986391. The cubic root of 643515013 is about 863.3486768821.

The spelling of 643515013 in words is "six hundred forty-three million, five hundred fifteen thousand, thirteen".